using System;
using System.Windows.Threading;
using ERVSimulator.Model;
using ErvProtocol;   // 공용 프로토콜 (단일 진실원본) : FrameParser/CtrlFrame/StatusEncoder/StatusRecord
using RunMode = ERVSimulator.Model.RunMode;   // ErvProtocol.RunMode 와 이름 충돌 해소

namespace ERVSimulator.Protocol
{
    // HOMENET (UART1, 115200 N81) <-> ErvDashboard
    //  규격/코덱 모두 공용 라이브러리 ErvProtocol 사용 (PC_ERV_Protocol.md).
    //  본 클래스는 ErvState <-> ErvProtocol.StatusRecord 매핑 + 제어명령 적용만 담당.
    public class HomeNetProtocol
    {
        readonly SerialChannel _ch;
        readonly ErvState _state;
        readonly DamperSequencer _seq;
        readonly Dispatcher _dispatcher;
        readonly DispatcherTimer _statusTimer;
        readonly FrameParser _parser = new();

        public event Action<string>? PacketReceived;
        public event Action<string>? PacketSent;

        public HomeNetProtocol(SerialChannel ch, ErvState state, DamperSequencer seq, Dispatcher dispatcher)
        {
            _ch = ch; _state = state; _seq = seq; _dispatcher = dispatcher;

            _parser.OnFrame += (cmd, pl) => _dispatcher.BeginInvoke(new Action(() => HandleFrame(cmd, pl)));
            _parser.OnError += msg => PacketReceived?.Invoke($"HomeNet {msg}");
            _ch.ByteReceived += b => _parser.FeedByte(b);

            _statusTimer = new DispatcherTimer(DispatcherPriority.Background) { Interval = TimeSpan.FromSeconds(1) };
            _statusTimer.Tick += (_, _) => { if (_ch.IsConnected) SendStatus(); };
            _statusTimer.Start();
        }

        // ---- ErvState → StatusRecord ----
        byte RunModeCode()
        {
            if (!_state.PowerOn) return 0;
            return _state.RunMode switch
            {
                RunMode.Ventilation => 1,
                RunMode.Auto => 2,
                RunMode.AirClean => 3,
                RunMode.Bypass => 4,
                _ => 1,
            };
        }

        StatusRecord BuildRecord()
        {
            int hp = _state.HystPreset;
            var s = new StatusRecord
            {
                Power = (byte)(_state.PowerOn ? 1 : 0),
                RunMode = RunModeCode(),
                AutoState = (byte)(_state.AutoConcentrate ? 1 : 0),
                FanMode = _state.FanMode,
                SubMode = (byte)((_state.SmartSleep ? 0x01 : 0) | (_state.CookingMode ? 0x02 : 0) | (_state.RecoveryMode ? 0x04 : 0)),
                Hood = (byte)((_state.HoodEnable ? 0x01 : 0) | (_state.HoodStatus ? 0x02 : 0) | (_state.HoodConnected ? 0x04 : 0)),
                HystPreset = (byte)hp,
                HystPm25 = _state.Pm25Db[hp],
                HystPm10 = _state.Pm10Db[hp],
                HystVoc = _state.VocDb[hp],
                HystCo2 = _state.Co2Db[hp],
                ErrorCode = _state.ErrorCode,
                Reset = _state.ResetState,
                ReserveRemainSec = _state.ReserveRemainSec,
            };

            for (int r = 0; r < 4; r++)
            {
                var room = _state.GetRoom(r + 1);
                var rr = s.Rooms[r];
                // 비트맵 : bit0=급기(SA) 열림 / bit1=배기(RA) 열림 (StatusRecord.RoomRecord 와 일치)
                rr.Damper = (byte)((room.MemorySA != 0 ? 0x01 : 0) | (room.MemoryRA != 0 ? 0x02 : 0));
                rr.Pm25 = room.Pm25;
                rr.Pm10 = room.Pm10;
                rr.Voc = room.Voc;
                rr.Co2 = room.Co2;
                rr.AirQuality = (byte)room.AirQuality;
                // 디퓨저가 응답마다 echo 하는 실제 LED 단수를 보고 → 디퓨저 수동 LED 제어가 대시보드에 반영됨
                rr.LedDim = (byte)room.LedReported;
                rr.LoadScore = room.Level;
                rr.FinalVolume = _state.FanMode;
                rr.Temp = (byte)Math.Clamp(room.Temp, 0, 255);
                rr.Humi = (byte)Math.Clamp(room.Humi, 0, 255);
            }

            // VSP : 환기1~4, 바이패스, 공청1~4
            for (int i = 1; i <= 4; i++) { s.Vsp[i - 1].Sa = _state.FanSAPreset_Vent[i]; s.Vsp[i - 1].Ea = _state.FanEAPreset_Vent[i]; }
            s.Vsp[4].Sa = _state.FanSAPreset_Bypass[1]; s.Vsp[4].Ea = _state.FanEAPreset_Bypass[1];
            for (int i = 1; i <= 4; i++) { s.Vsp[4 + i].Sa = _state.FanSAPreset_Air[i]; s.Vsp[4 + i].Ea = _state.FanEAPreset_Air[i]; }

            // 히스테리시스 데드밴드 테이블
            for (int i = 0; i < 3; i++)
            {
                s.HystTable[i].Pm25 = _state.Pm25Db[i];
                s.HystTable[i].Pm10 = _state.Pm10Db[i];
                s.HystTable[i].Voc = _state.VocDb[i];
                s.HystTable[i].Co2 = _state.Co2Db[i];
            }

            // 모드별 오염단계 임계표
            for (int i = 0; i < 3; i++)
                for (int k = 0; k < 4; k++)
                {
                    s.ThrTable[i].Co2[k]  = _state.Co2Thr[i][k];
                    s.ThrTable[i].Pm25[k] = _state.Pm25Thr[i][k];
                    s.ThrTable[i].Pm10[k] = _state.Pm10Thr[i][k];
                    s.ThrTable[i].Voc[k]  = _state.VocThr[i][k];
                }
            return s;
        }

        public void SendStatus()
        {
            var frame = StatusEncoder.BuildStatusFrame(BuildRecord());
            _ch.Send(frame, frame.Length);
            string autoTag = _state.RunMode == RunMode.Auto ? (_state.AutoConcentrate ? " 집중" : " 분산") : "";   // 집중/분산은 자동모드에서만
            PacketSent?.Invoke($"HomeNet TX STATUS(0x81) [{(_state.PowerOn ? "ON" : "OFF")} {_state.RunMode} {_state.FanMode}단{autoTag}]");
        }

        // ---- 수신 제어명령 적용 + ACK ----
        void HandleFrame(byte cmd, byte[] pl)
        {
            byte result = 0;
            bool modeChanged = false;

            switch (cmd)
            {
                case CtrlFrame.CTRL_POWER:
                    if (pl.Length >= 1)
                    {
                        bool on = pl[0] != 0;
                        _state.PowerOn = on;
                        if (on)
                        {
                            // 전원 ON : 환기 모드 + 풍량 1단. 디퓨저 개방·LED 는 AutoLogic 이 댐퍼 상태에 맞춰 구동.
                            _state.RunMode = _state.SetRunMode = RunMode.Ventilation;
                            _state.FanMode = _state.SetFanMode = 1;
                        }
                        else
                        {
                            // 전원 OFF : 정지 (댐퍼 닫힘·LED 소등은 AutoLogic 이 처리)
                            _state.FanMode = _state.SetFanMode = 0;
                        }
                        // 전원 토글 시 수동 LED·댐퍼 해제 → 자동 추종 복귀
                        for (int r = 1; r <= 4; r++) { var rm = _state.GetRoom(r); rm.LedManual = false; rm.DamperManual = false; }
                        modeChanged = true;
                    }
                    else result = 1;
                    break;
                case CtrlFrame.CTRL_RUNMODE:
                    if (pl.Length >= 1)
                    {
                        if (pl[0] == 0) _state.PowerOn = false;
                        else
                        {
                            _state.PowerOn = true;
                            RunMode m = pl[0] switch { 1 => RunMode.Ventilation, 2 => RunMode.Auto, 3 => RunMode.AirClean, 4 => RunMode.Bypass, _ => RunMode.Ventilation };
                            _state.RunMode = _state.SetRunMode = m;
                            // 운전모드 전환 시 풍량 1단 (자동은 부하점수로 결정하므로 제외)
                            if (m != RunMode.Auto) _state.FanMode = _state.SetFanMode = 1;
                        }
                        // 모드 전환 시 수동 댐퍼만 해제 → 새 모드는 기본(전실 개방)에서 시작.
                        // 수동 LED 디밍값은 모드가 바뀌어도 유지(사용자 요청, 전원 OFF 시에만 해제).
                        for (int r = 1; r <= 4; r++) _state.GetRoom(r).DamperManual = false;
                        modeChanged = true;
                    }
                    else result = 1;
                    break;
                case CtrlFrame.CTRL_FAN:
                    if (pl.Length >= 1)
                    {
                        // 모드별 풍량 상한 : 바이패스 1단, 그 외 4단 (자동은 부하점수로 결정)
                        byte sp = pl[0];
                        byte max = _state.RunMode == RunMode.Bypass ? (byte)1 : (byte)4;
                        if (sp > max) sp = max;
                        _state.FanMode = _state.SetFanMode = sp; modeChanged = true;
                    }
                    else result = 1;
                    break;
                case CtrlFrame.CTRL_SUBMODE:   // [type][on] 1수면 2조리 3회복
                    if (pl.Length >= 2)
                    {
                        if (pl[0] == 1) _state.ExtRunMode = (byte)(pl[1] != 0 ? 4 : 0);
                        else if (pl[0] == 2) _state.HoodEnable = pl[1] != 0;
                        else if (pl[0] == 3) _state.ExtRunMode = (byte)(pl[1] != 0 ? 1 : 0);
                        else result = 1;
                    }
                    else result = 1;
                    break;
                case CtrlFrame.CTRL_HOOD:
                    if (pl.Length >= 1) _state.HoodEnable = pl[0] != 0; else result = 1;
                    break;
                case CtrlFrame.CTRL_HYST_PRESET:
                    if (pl.Length >= 1 && pl[0] < 3) _state.HystPreset = pl[0]; else result = 1;
                    break;
                case CtrlFrame.CTRL_HYST_VALUE:   // [preset][pm25][pm10][voc][co2] u16 BE
                    if (pl.Length >= 9 && pl[0] < 3)
                    {
                        int ps = pl[0];
                        _state.Pm25Db[ps] = (ushort)((pl[1] << 8) | pl[2]);
                        _state.Pm10Db[ps] = (ushort)((pl[3] << 8) | pl[4]);
                        _state.VocDb[ps] = (ushort)((pl[5] << 8) | pl[6]);
                        _state.Co2Db[ps] = (ushort)((pl[7] << 8) | pl[8]);
                    }
                    else result = 1;
                    break;
                case CtrlFrame.CTRL_DAMPER:   // [room][onoff] — 수동 댐퍼 : 비자동(환기/공청/바이패스)에서 위치 유지
                    if (pl.Length >= 2 && pl[0] >= 1 && pl[0] <= 4)
                    {
                        var rm = _state.GetRoom(pl[0]);
                        int ang = pl[1] != 0 ? 110 : 0;
                        rm.MemorySA = rm.CurrentSA = ang;
                        rm.MemoryRA = rm.CurrentRA = ang;
                        rm.DamperManual = true;   // 자동로직이 덮어쓰지 않도록 (자동/모드전환 시 해제)
                    }
                    else result = 1;
                    break;
                case CtrlFrame.CTRL_LED:   // [room][dim] — 수동 조작 : 자동 추종 해제하고 지정값 유지
                    if (pl.Length >= 2 && pl[0] >= 1 && pl[0] <= 4)
                    {
                        var rm = _state.GetRoom(pl[0]);
                        rm.LightBright = pl[1];
                        rm.LedManual = true;
                    }
                    else result = 1;
                    break;
                case CtrlFrame.CTRL_RESERVE:   // [hours 0~8] : N시간 후 전원 OFF (0=해제)
                    if (pl.Length >= 1 && pl[0] <= 8)
                    {
                        int h = pl[0];
                        _state.ReserveHours = h;
                        _state.ReserveRemainSec = h * 3600;   // 0이면 해제. 카운트다운/전원OFF는 ReserveTick(1s)이 처리
                    }
                    else result = 1;
                    break;
                case CtrlFrame.REQ_STATUS:
                    break;
                case CtrlFrame.CTRL_RESET:
                    if (pl.Length >= 1) _state.ResetState = (byte)(pl[0] != 0 ? 1 : 0); else result = 1;
                    break;
                case CtrlFrame.CTRL_VSP:   // [group][index][sa(2)][ea(2)]
                    if (pl.Length >= 6) result = SetVsp(pl[0], pl[1], (pl[2] << 8) | pl[3], (pl[4] << 8) | pl[5]); else result = 1;
                    break;
                case CtrlFrame.CTRL_HYST_THR:   // [preset][pollutant][L1~L4 u16] : 오염단계 임계 설정
                    if (pl.Length >= 10 && pl[0] < 3 && pl[1] < 4)
                    {
                        int ps = pl[0], g = pl[1];
                        ushort[] arr = g switch { 0 => _state.Co2Thr[ps], 1 => _state.Pm25Thr[ps], 2 => _state.Pm10Thr[ps], 3 => _state.VocThr[ps], _ => null! };
                        if (arr != null) for (int k = 0; k < 4; k++) arr[k] = (ushort)((pl[2 + k * 2] << 8) | pl[3 + k * 2]);
                        else result = 1;
                    }
                    else result = 1;
                    break;
                default: result = 1; break;
            }

            PacketReceived?.Invoke($"HomeNet RX CMD=0x{cmd:X2} len={pl.Length} → {(result == 0 ? "OK" : "ERR")}");

            if (modeChanged) _seq.NotifyCommandChanged();

            var ack = StatusEncoder.BuildAckFrame(cmd, result);
            _ch.Send(ack, ack.Length);

            if (cmd == CtrlFrame.REQ_STATUS) SendStatus();
        }

        byte SetVsp(int grp, int idx, int sa, int ea)
        {
            if (grp == 0 && idx >= 1 && idx <= 4) { _state.FanSAPreset_Vent[idx] = (ushort)sa; _state.FanEAPreset_Vent[idx] = (ushort)ea; }
            else if (grp == 1 && idx == 1) { _state.FanSAPreset_Bypass[1] = (ushort)sa; _state.FanEAPreset_Bypass[1] = (ushort)ea; }
            else if (grp == 2 && idx >= 1 && idx <= 4) { _state.FanSAPreset_Air[idx] = (ushort)sa; _state.FanEAPreset_Air[idx] = (ushort)ea; }
            else return 1;
            return 0;
        }
    }
}